RF Exposure Evaluation Rev1

FCC ID: S8J-WDR3750

RF Exposure Info

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FCCID_2579637

RF EXPOSURE EVALUATION EUT Specification EUT 750Mbps Wireless Dual Band 11AC Router FCC ID S8J-WDR3750 Frequency band WLAN: 2.412GHz ~ 2.462GHz (Operating) WLAN: 5.18GHz ~ 5.32GHz / 5.50GHz ~ 5.70GHz WLAN: 5.745GHz ~ 5825GHz Others Device category Portable (<20cm separation) Mobile (>20cm separation) Others ___ Exposure classification Occupational/Controlled exposure (S = 5mW/cm2) General Population/Uncontrolled exposure (S=1mW/cm2) Antenna diversity Single antenna Multiple antennas Tx diversity Rx diversity Tx/Rx diversity Max. output power For 2.4GHz Band: 802.11b: 17.42dBm(0.055208W) 802.11g: 14.59dBm (0.028774W) 802.11n(HT20): 12.62dBm(0.018281W) 802.11n(HT40): 11.85dBm (0.015311W) For 5GHz Band: 802.11a: 13.59dBm(0.022856W) 802.11n(HT20): 11.45dBm(0.013964W) 802.11n(HT40): 10.42dBm(0.011015W) 802.11ac(HT20): 9.03dBm(0.007998W) 802.11ac(HT40): 8.42dBm(0.006850W) 802.11ac(HT80): 5.73dBm(0.003741W) Antenna gain (Max) 5.0dBi ( for per antenna port Max) 8.01dBi for MIMO(Ant0+Ant1 Directional Gain) Evaluation applied MPE Evaluation SAR Evaluation 1

Applicable Standard: Systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy levels in excess limit for maximum permissible exposure. In accordance with 47 CFR FCC Part 2 Subpart J. Section 2.1091 this device has been defined as a mobile device whereby a distance of 0.2m Normally can be maintained between the user and the device. Limits for Maximum Permissible Exposure(MPE) Frequency Electric Field Magnetic Field Power Average Range(MHz) Strength(V/m) Strength(A/m) Density(mW/cm2) Time (A) Limits for Occupational/Control Exposures 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842/f 4.89/f (900/f)* 6 30-300 61.4 0.163 1.0 6 300-1500 -- -- F/300 6 1500-100000 -- -- 5 6 (B) Limits for General Population/Uncontrol Exposures 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 -- -- F/1500 30 1500-100000 -- -- 1 30 Friis transmission formula: Pd=(Pout*G)\(4*pi*R2) Where Pd= Power density in mW/cm2, Pout=output power to antenna in Mw G= gain of antenna in linear scale, Pi=3.1416 R= distance between observation point and center of the radiator in cm Pd the limit of MPE, 1mW/cm2. If we know the maximum gain of the antenna and total power input to the antenna, through the calculation, we will know the distance where the MPE limit is reached. 2

Measurement Result Max power Result: For 2.4G Band: Operation Channel Channel Measurement Level Limit Mode Number Frequency (dBm) (dBm) Verdict (MHz) Ant0 Ant1 Sum 1 2412 17.42 17.02 -- 30 PASS 802.11b 6 2437 16.05 15.22 -- 30 PASS 11 2462 15.72 14.52 -- 30 PASS 1 2412 14.59 13.05 -- 30 PASS 802.11g 6 2437 12.68 12.49 -- 30 PASS 11 2462 11.45 11.41 -- 30 PASS 1 2412 9.42 9.12 12.28 28 PASS 802.11n 6 2437 9.86 9.35 12.62 28 PASS (HT20) 11 2462 8.05 9.42 11.80 28 PASS 3 2422 7.06 7.42 10.25 28 PASS 802.11n 6 2437 8.42 7.69 11.08 28 PASS (HT40) 9 2452 9.42 8.16 11.85 28 PASS For 5GHz Band: Max Output Power (dBm) Test Limit 802.11a 802.11n 802.11n 802.11ac 802.11ac 802.11a Result Channel (dBm) (HT20) (HT40) (HT20) (HT40) (HT80) Lowest 12.40 11.45 10.42 8.46 8.42 5.73 Middle 11.04 10.59 8.05 9.03 7.06 30 Pass Highest 13.59 9.42 7.46 6.45 3

For 2.4G Band: Antenna 0: Tune up Power Output Power tolerance Max tune up Ant. density at Operating Test Peak Ant. Gain density (dBm) conducted Gain 20cm Mode Channel power (numeric) Limits power(dBm) (dBi) (mW/ (mW) (mW/cm2 ) cm2 ) 1 17±1 18 63.10 5 3.162 0.039691 1 802.11b 6 16±1 17 50.12 5 3.162 0.031528 1 11 16±1 17 50.12 5 3.162 0.031528 1 1 15±1 16 39.81 5 3.162 0.025043 1 802.11g 6 13±1 14 25.12 5 3.162 0.015801 1 11 11±1 12 15.85 5 3.162 0.009970 1 1 9±1 10 10.00 5 3.162 0.006291 1 802.11n 6 10±1 11 12.59 5 3.162 0.007919 1 (H20) 11 8±1 9 7.94 5 3.162 0.004997 1 3 7±1 8 6.31 5 3.162 0.003969 1 802.11n 6 8±1 9 7.94 5 3.162 0.004997 1 (H40) 9 9±1 10 10.00 5 3.162 0.006291 1 Antenna 1: Tune up Power Output Power tolerance Max tune up Ant. density at Operating Test Peak Ant. Gain density (dBm) conducted Gain 20cm Mode Channel power (numeric) Limits power(dBm) (dBi) (mW/ (mW) (mW/cm2 ) cm2 ) 1 17±1 18 63.10 5 3.162 0.039691 1 802.11b 6 15±1 16 39.81 5 3.162 0.025043 1 11 15±1 16 39.81 5 3.162 0.025043 1 1 13±1 14 25.12 5 3.162 0.015801 1 802.11g 6 12±1 13 19.95 5 3.162 0.012551 1 11 11±1 12 15.85 5 3.162 0.009970 1 1 9±1 10 10.00 5 3.162 0.006291 1 802.11n 6 9±1 10 10.00 5 3.162 0.006291 1 (H20) 11 9±1 10 10.00 5 3.162 0.006291 1 3 7±1 8 6.31 5 3.162 0.003969 1 802.11n 6 8±1 9 7.94 5 3.162 0.004997 1 (H40) 9 8±1 9 7.94 5 3.162 0.004997 1 4

MPE Result: For 2.4G Band: Operation Channel Channel Power density at 20cm (mW/ cm2 ) Power Mode Number Frequency Ant0 Ant1 Sum density Verdict (MHz) Limits (mW/cm2 ) 1 2412 0.039691 0.039691 -- 1 PASS 802.11b 6 2437 0.031528 0.025043 -- 1 PASS 11 2462 0.031528 0.025043 -- 1 PASS 1 2412 0.025043 0.015801 -- 1 PASS 802.11g 6 2437 0.015801 0.012551 -- 1 PASS 11 2462 0.009970 0.009970 -- 1 PASS 1 2412 0.006291 0.006291 0.012582 1 PASS 802.11n 6 2437 0.007919 0.006291 0.014210 1 PASS (HT20) 11 2462 0.004997 0.006291 0.011288 1 PASS 3 2422 0.003969 0.003969 0.007938 1 PASS 802.11n 6 2437 0.004997 0.004997 0.009994 1 PASS (HT40) 9 2452 0.006291 0.004997 0.011288 1 PASS 5

For 5G Band: Power Power Output Tune up Max tune up Ant. density at density Operating Test Peak Ant. Gain tolerance conducted Gain 20cm Limits Mode Channel power (numeric) (dBm) power(dBm) (dBi) (mW/ (mW/cm2 (mW) cm2 ) ) 149 12±1 13 19.95 5 3.162 0.012551 1 802.11a 157 11±1 12 15.85 5 3.162 0.009970 1 165 14±1 15 31.62 5 3.162 0.019893 1 149 11±1 12 15.85 5 3.162 0.009970 1 802.11n 157 11±1 12 15.85 5 3.162 0.009970 1 (HT20) 165 9±1 10 10.00 5 3.162 0.006291 1 802.11n(H 151 10±1 11 12.59 5 3.162 0.007919 1 T40) 159 8±1 9 7.94 5 3.162 0.004997 1 149 8±1 9 7.94 5 3.162 0.004997 1 802.11ac 157 9±1 10 10.00 5 3.162 0.006291 1 (HT20) 165 7±1 8 6.31 5 3.162 0.003969 1 149 8±1 9 7.94 5 3.162 0.004997 1 802.11ac 157 7±1 8 6.31 5 3.162 0.003969 1 (HT40) 165 6±1 7 5.01 5 3.162 0.003153 1 802.11a 157 6±1 7 5.01 5 3.162 0.003153 1 (HT80) 6


Document Created: 2015-04-08 16:36:49
Document Modified: 2015-04-08 16:36:49
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